The Wild Delight Finch Sock Feeder is an all-in-one feed and feeder that contains only the finest premium grade Nyjer Seed*, an oil seed preferred by finches and other birds. Primary Species: American Goldfinches, Purple Finches, House Finches and Cassins Finches. Preferred Feeder Type: Finch Sock (as described). This product is produced and stored in facilities that use milk, eggs, fish, Crustacean shellfish, tree nuts, wheat, peanuts, and soybeans and thus may contain one or more of these ingredients.